Final answer:
The $100,000 would most appropriately be recorded in a permanent fund.
Step-by-step explanation:
The $100,000 would most appropriately be recorded in a permanent fund.
A permanent fund is a type of fund that is established to generate earnings to support a specific purpose in perpetuity. In this case, the donor's contribution is intended to be invested, and the earnings generated from the investment will be used for the maintenance of the city municipal swimming pool.